1. Associate Professor, Dept. of Structural Engineering, Faculty of Engineering, Cairo Univ., Giza, Egypt. E-mail: mm_marzouk@yahoo.com
2. Procurement Manager, ALEZZ Flat Steel, 10th Shehab St., Mohandeseen, Giza, Egypt.
3. Professor of Construction Engineering and Management, Dept. of Structural Engineering, Faculty of Engineering, Cairo Univ., Giza, Egypt.